Method of producing hollow fiber polymer membranes

US5980795A · kind A · utility

Assignee

• GKSS-Forschungszentrum Geesthacht GmbH · DE

Inventors

• Rebecca Klötzer · Oebisfelde, DE
• Bernd Seibig · Geesthacht, DE
• Dieter Paul · Neunkirchen, DE
• Klaus-Viktor Peinemann · Geesthacht, DE

Key dates

• Filing date: Nov 28, 1997
• Grant date: Nov 9, 1999
• Expiry date: Nov 28, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2325/022
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a method of producing hollow fiber membranes, wherein a molten polymer charged with a gas under pressure is provided in an extrusion apparatus, the polymer melt including the gas under pressure is extruded from the extrusion apparatus through a hollow fiber-forming extrusion nozzle with a predetermined pressure drop which provides for a concurrent expansion of the gas contained in the polymer melt thereby forming a porous hollow fiber membrane.